Following the procedure outlined in [1]}, [2]}, [3]}
and using the notations of Appendix A in [4]} we now explain
how to obtain the consistency around the cube for the
non-autonomous Hietarinta equation (REF ) and discuss its
properties.
First we denote by
\(\widehat{Q}_{n,m} = \widehat{Q}_{n,m} ( u_{n,m},u_{n+1,m},u_{n,m+1},u_{n+1,m+1};e_{1},o_{1},e_{2},o_{2} ) \) 
